"""Audit writer: upserts a row in kevin_signal_bridge_state per processed mention."""

from __future__ import annotations

import uuid
from decimal import Decimal
from typing import Any, Callable

from sqlalchemy.dialects.postgresql import insert as pg_insert

from shared.models.meet_kevin_trading import KevinSignalBridgeState
from shared.models.trading import Signal as SignalRow
from shared.schemas.trading import TradeSignal


class AuditWriter:
    def __init__(self, session_factory: Callable[..., Any]) -> None:
        self.session_factory = session_factory

    async def persist_signal(self, signal: TradeSignal) -> None:
        """Persist a TradeSignal to the `signals` table so downstream
        FKs (kevin_signal_bridge_state.signal_id, trades.signal_id)
        resolve. Idempotent on the signal UUID — caller should call
        once per published signal before writing the audit row.
        """
        async with self.session_factory() as session:
            stmt = pg_insert(SignalRow).values(
                id=signal.signal_id,
                ticker=signal.ticker,
                direction=signal.direction,
                strength=signal.strength,
                strategy_sources={"sources": signal.strategy_sources},
                strategy_id=signal.strategy_id,
                acted_on=False,
            )
            # Idempotent — if the row already exists (e.g. retry path)
            # leave it alone.
            stmt = stmt.on_conflict_do_nothing(index_elements=["id"])
            await session.execute(stmt)
            await session.commit()

    async def write(
        self,
        *,
        mention_id: int,
        bridge_status: str,
        effective_conviction: Decimal | None = None,
        signal_id: uuid.UUID | None = None,
        trade_id: uuid.UUID | None = None,
        notes: str | None = None,
    ) -> None:
        """Upsert one audit row (mention_id is unique)."""
        async with self.session_factory() as session:
            stmt = pg_insert(KevinSignalBridgeState).values(
                id=uuid.uuid4(),
                mention_id=mention_id,
                bridge_status=bridge_status,
                effective_conviction=effective_conviction,
                signal_id=signal_id,
                trade_id=trade_id,
                notes=notes,
            )
            stmt = stmt.on_conflict_do_update(
                index_elements=["mention_id"],
                set_={
                    "bridge_status": stmt.excluded.bridge_status,
                    "effective_conviction": stmt.excluded.effective_conviction,
                    "signal_id": stmt.excluded.signal_id,
                    "trade_id": stmt.excluded.trade_id,
                    "notes": stmt.excluded.notes,
                },
            )
            await session.execute(stmt)
            await session.commit()